Durable pressure filtration membranes based on polyaniline-polyimide P84 blends

Yusoff, Izzati Izni and Rohani, Rosiah and Khairul Zaman, Nadiah and Junaidi, Mohd Usman Mohd and Mohammad, Abdul Wahab and Zainal, Zamardina (2018) Durable pressure filtration membranes based on polyaniline-polyimide P84 blends. Polymer Engineering and Science, 59 (S1). E82-E92. ISSN 0032-3888

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Official URL: https://doi.org/10.1002/pen.24862

Abstract

A pressure filtration membrane from conducting polymer polyaniline (PANI) is known to possess low mechanical strength and thermal stability. Therefore, it is believed that the properties of the membrane can be enhanced by blending PANI with a conventional polymer like polyimide (PI), which possesses high mechanical strength and thermal stability. A thermal analysis revealed that polymer chain of blend membranes started to break beyond the melting temperature of pure PANI membrane indicating that the addition of PI hindered the degradation of PANI and thus slowed down the decomposition process. Mechanical tests further showed that PANI/PI membrane had a tensile strength that was 60% higher than pure PANI membrane. Furthermore, the surface hydrophilicity and negativity of the blend membrane increased as it was doped in acid, thereby reflecting the exploitation of advantages of both polymers. Rejection at various molecular ranges of PEGs showed that PANI/PI membrane was initially in the ultrafiltration (UF) range, but later fell into the nanofiltration (NF) range when an acid dopant was introduced to the membrane. According to the long-term filtration performance, the PANI/PI membrane was able to sustain a rejection of up to 99% in Congo red solution with just a slight reduction in flux.

Item Type: Article
Uncontrolled Keywords: Azo dyes; Blending; Conducting polymers; Doping (additives); Hydrophilicity; Membranes; Polyaniline; Polyimides; Tensile strength; Thermoanalysis; Thermodynamic stability
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 14 Jan 2019 03:42
Last Modified: 14 Jan 2019 03:42
URI: http://eprints.um.edu.my/id/eprint/19967

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